05000302/LER-1980-054-03, /03L-0:on 801210,regulating Rod Group Insertion Limits Exceeded.Caused by Anticipated Rod Movements to Control Reactor Power Burnout.Boron Added to Reactor Coolant

/03L-0:on 801210,regulating Rod Group Insertion Limits Exceeded.Caused by Anticipated Rod Movements to Control Reactor Power Burnout.Boron Added to Reactor Coolant

ML20002C194
Person / Time
Site:	Crystal River
Issue date:	01/06/1981
From:	Hernandez V FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20002C191	List: 05000302/LER-1980-054, Forwards LER 80-054/03L-0 05000302/LER-1980-054-03, /03L-0:on 801210,regulating Rod Group Insertion Limits Exceeded.Caused by Anticipated Rod Movements to Control Reactor Power Burnout.Boron Added to Reactor Coolant
References
LER-80-054-03L, LER-80-54-3L, NUDOCS 8101090597
Download: ML20002C194 (2)

LER-1980-054, /03L-0:on 801210,regulating Rod Group Insertion Limits Exceeded.Caused by Anticipated Rod Movements to Control Reactor Power Burnout.Boron Added to Reactor Coolant

Event date:
Report date:
3021980054R03 - NRC Website

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SUPPLEMENTARY INFORMATION

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o Report No.:

50-302/80-054/03L-0 Facility:

Crystal River Unit #3 Report Date:

January 6,1981 Occurrence Date:

December 10, 1980 Identification of Occurrence:

Regulating Rod Group Insertion limit exceeded contrary to Technical Specification 3.1.3.6.

Conditions Prior to Occurrence:

Mode 1 power operation (100%).

Description of Occurrence:

At 1007 it was discovered that Regulating Rod Group Insertion limits were exceeded when Group 6 position was reduced to less than 177% rod index following a power increase to 100%

rated thermal power. The Reactor Coolant System was borated to 690 ppmB and the Rod Insertion limits were within specification at 1104.

Designation of Apparent Cause:

The cause of this event is attributed to anticipated rod movements to control reactor power during Xenon burnout.

Analysis of Occurrence:

Redundancy NA. There was no effect upon the health or safety of the general public.

Corrective Action

A study is being initiated by the plant staff to determine possible actions to prevent recurrence. This study will be completed by June 30, 1981.

l Failure Data:

This is the first occurrence of exceeding the Regulating Rod Group Insertion limit, and the second event reported under this Specification.

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